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Sept. 16, 1924.

G. AEGHELE SHIFT MECHANISM FOR TYPEWBITING MACHINES Filed Jan. 23 1924 QMMULMMKK I Patented Sept. 16, "1924.

UNITED STATES GOTTLOTB AICHELE, O1 NELLINGEN, NEAR EEAESLINQTEN,

SHIFT MIEUHANISMI FOR [iiYPElUl'Et-ITING HEACI'IINES.

Application filed January 23, 1924. Serial No. 687,904.

To all whom it may concern:

Be it known that I, Gorrnon Aronnnn, a citizen of the State of VVurttemberg, Gen

many, residing at Nellingen, near Esslingen,

WVurttemberg Germany, Kaiserstrasse 9), have invented certain new and useful Tmprovements in Shift li lechanism for Typewriting hlachines, of which the following is a specification.

It has hereto-fore been proposed to pr0- vide those parts of a typewriter whereby the shifting of the type bar supporting segments is limited, with elastic insertions to dampen and reduce the noise, but practical experi ence has shown that such insertions, after a short time, are deformed in such a way that the path covered by the typebasket or segment in the recurring shifting adjustments is lengthened; as a result of this the lines of typewritten matter are rendered at least partly uneven and undulatory, and the appearance to the eye is more or less impaired, especially where large upright capitals are employed.

The object of my invention to provide a novel means whereby this drawback is obviated; the means referred to may comprise a stationary guide provided with a prefen ably inclined slot and a slide subjected to the action of springs acting in opposite directions and havingaslot inclined oppositely to the slot of the guide, said slidebeing in engagement with the system of levers forming the shifting mechanism of the typewriting machine. The arrangement is such that the shifting of the type bar supporting segment is limited by the slot which is provided in the slide. This arrangement and ccmbiuation of parts may be modified in such a way that the direction of the end sections of the slot deviates from the main part thereof in order to reduce the size of the abutment surface.

My invention is illustrated, by way of example, in the accompanying drawing", in which Figure 1 is a side-view of the shifting; mechanism for shifting the type-bar supporting segment for upper and lower case printing"; Figure 2 is a cresssection of Fig);- ure 1; Figure 3 is a separate View of the parts shown in the right-hand lower part of Figural, some of said parts being in another position; and Figure at is a similar illustration showing the movable parts in still another position, as is all more fully described l'iereinafter.

Referring to Figure 1, a is a double-armed shift-key having a finger key a, c a double armed intermediate lever, and Z} a thrustrod, through the medium of which the lever c is rocked when the shiftdr-ey a is depressed. o is a pin on the shift-key a whereby the motion of said shift-key a is transmitted to the rod 6, and a is a pivot connecting the parts 5 and c with each other. 6' is the supporting pivot of the lever 0. The pivot 8 serves also for connecting; the parts 5 and c with a member (Z which carries the type-lever suppor=ting-seginent or case shift element (2; to the latter are attached, in known manner, the type-bars f provided with the types 7" veering the characters in and i, of which either the lower ones (2') or the upper ones (it) engage the paper passing over the platen or roller 5/, according to the position of the shifting mechanism.

From the rear end of the lever c. a link extends obliquely downwards and is provided at its lower end with a small. roll Z movable in stationary slot m formed in a stationary casing; or guide '0 and extending at an inclination corresponding approximately to the oblique normal position of the link 7 the casing e is lined in place upon the frame 2 of the typewriter by screws .2 or other suitable fastening means. The roll 3 is of suilicient axial length toproject also into a slot m provided in a slide a movable in the guide casing c, said slot in being in dined at right angles with respectto the slot m. The slide a is subjected to the action of an upper spring 0 and of a lower spring 3). both springs being tensile springs and opposingeach other; that is to say, in the normal condition of the pa ts, the spring; 0 is contracted and the spring; p is extended as indicated in F 2, while, when the parts are in the upper case printing position the spring 0 is extended and the spring p is contracted, as shown in Fig". l. The spring 0 is guided by a pin a2 and. the spring 37 is guided by a pin y, both pins serving also to guide the slide a in its movements in the easing '0 which, as previously stated, is aflixed to the frame part by screws .2. One end of the spring 0 is suitably connected with the frame a and the other end thereof is suitably connocted with the slide a so as to be stretched in the intended manner as the slide a descends from its normal position; simi; larly, the one end of the spring; 7) is attached in any suitable way to the slide a and its trated in Figure 3.

other end is fixed to the frame 2 in any suitable Way, so that said spring 29 will be stretched in the manner intended as the slide a rises in a return movement toward its normal position. It will be understood that the pin w is rigidly secured to the frame .2 and that the slide a slides thereon while the pin 2 is carried by the slide a and slidably moves in the frame a.

When thekey a of the shift-key a is depressed, in order to raise the types 7' so as to cause'the characters 2' to be impressed upon the paper, instead of the characters h, the lever 0 is pivotally rocked and the link 16 is'depressed. This causes the roll Z to move downwardly in the slot m and to exert a camming action upon the walls of the slot at whereby the slide it is moved downwards in the guide casing o. This downward motion is assisted by the pulling action of the tensile spring 10 in passing from the extended position of F ig. 2 to the contracted position of Fig. 4:, the tensile spring 0 being at the same time correspondingly stretched from a contracted position to an extended position, and thus to a progressively increas ing degree opposing the downward movement of the slide a. Because of this downward movement, the position of the slot m relatively to the slot m changes, so that when the parts are in anintermediate position the two slots cross each other, as illus- When the parts reach their final positions, as shown in Figure at, the roll Z is in its end position in the lower end of the slot at and the upper end of the slot m, and the slide a has arrived in its lowest position. The spring 0 has now been stretchedand attained its maximum tension and by its gradually developed resistance to the drop of the slide a and its associated parts brings the same to rest without noise and any appreciable shock. When the movable parts move in the opposite direction, the slide a is at first drawn upwards by the spring 0, which upward movement the spring 79 opposes to a progressingly increasing degree, as it is gradually stretched from the contracted position shown in Fig. back to the extended position" of Fig. 2, so that when the roll Z approaches its other end position, the

tension of said spring p hasbeen developed to an extent sufiicient to check the motion of the movable parts which thus resume their normal position without appreciable shocks or jars.

I claim:

1. In a typewriting machine, the combination of a supporting segment, a stationary guide member having an oblique slot, a slide arranged in said guide member and having also an oblique slot, which crosses said other slot, a lever operatively connected at one end with the segment of the typewriting machine, a link operatively connected with the other end of said lever and means provided on said link for engaging both of said slots simultaneously.

2. In a typewriting machine, a case shift element, means for selectively shifting said element from a normal position to a case shift position, a shiftable means operatively connected to the case shift element, and re silient means on opposite sides of said shiftable means for providing a gradually increasing resistance respectively to the shifting movements of said element from its normal position and. to its return movements to said normal position to neutralize impact shocks incidental to such shifting and return to normal position.

3. In a typewriting machine, the combination of a support for a plurality of type bars having upper and lower case characters thereon, shifting mechanism whereby said support is shifted to selectively bring the upper and lower case characters into printing positions, a stationary guide casing provided with an inclined slot, a slide movable in said casing and provided with a slot inclined in the opposite direction to that of the casing, a link operatively connected with said shifting mechanism, a roller carried by said link and extending into said slots for moving said slide in accordance with the shifting movements of said shifting mechanism and opposed springs for developing a progressively increasing resistance to the shifting movements of said slide in each direction whereby shocks incidental to the operation of the shifting mechanism are neutralized.

In testimony whereof I aiiix my signature in presence of two witnesses.

GOTTLOB A I'C HEL'E.

\Vit-nesses H. UEBELE, O. LEMNITZER, Jr. 

